TYMP and mitochondrial neurogastrointestinal encephalomyopathy: The study of erythrocyte-encapsulated thymidine phosphorylase (EE-TP) in treating mitochondrial neuro gastrointestinal encephalomyopathy (MNGIE) involved three adult patients with MNGIE who received intravenous EE-TP at increasing doses over a period of 4 weeks.